I got this error message back from the MTA:
This message was created automatically by mail delivery software (Exim).
A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed:
Connection timed out:
retry timeout exceeded
This is fine so far. What puzzles me is the fact that the created account disapeared. This is reproducible. The account was created again (same email address), the delivery error occoured again and the account disapeared.
Is this on purpose?